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首页> 外文期刊>Journal of Physical Oceanography >Controls on Turbulent Mixing in a Strongly Stratified and Sheared Tidal River Plume
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Controls on Turbulent Mixing in a Strongly Stratified and Sheared Tidal River Plume

机译：强分层和剪切潮汐河羽中湍流混合的控制

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Considerable effort has been made to parameterize turbulent kinetic energy (TKE) dissipation rate epsilon and mixing in buoyant plumes and stratified shear flows. Here, a parameterization based on Kunze et al. is examined, which estimates epsilon as the amount of energy contained in an unstable shear layer (Ri < Ri(c)) that must be dissipated to increase the Richardson number Ri = N-2/S-2 to a critical value Ric within a turbulent decay time scale. Observations from the tidal Columbia River plume are used to quantitatively assess the relevant parameters controlling epsilon over a range of tidal and river discharge forcings. Observed epsilon is found to be characterized by Kunze et al.'s form within a factor of 2, while exhibiting slightly decreased skill near Ri 5 Ric. Observed dissipation rates are compared to estimates from a constant interfacial drag formulation that neglects the direct effects of stratification. This is found to be appropriate in energetic regimes when the bulk-averaged Richardson number Rib is less than Ri(c)/4. However, when Rib. Ric/4, the effects of stratification must be included. Similarly, epsilon scaled by the bulk velocity and density differences over the plume displays a clear dependence on Rib, decreasing as Rib approaches Ric. The Kunze et al. epsilon parameterization is modified to form an expression for the nondimensional dissipation rate that is solely a function of Rib, displaying good agreement with the observations. It is suggested that this formulation is broadly applicable for unstable to marginally unstable stratified shear flows.
机译：在参数化湍流动能（TKE）耗散率ε以及混合浮力羽流和分层剪切流方面已经做出了相当大的努力。在此，基于Kunze等人的参数化。进行了检查，将ε估算为不稳定剪切层（Ri

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